Complex dynamics of drill-strings: Theory and experiments

Marian Wiercigroch*, Marcin Kapitaniak, Vahid Vaziri, Krishnan Nandakumar

*Corresponding author for this work

Research output: Contribution to journalConference article

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Abstract

We investigate complex drill-string dynamics in a downhole drilling where strong nonlinear interactions between various types of vibration take place. First, we present a low dimensional model of the downhole drilling where a drill-bit cutting a rock formation has a strong coupling between torsional and axial oscillations. The model can be used to study drilling stability as an example results are given. Then we introduce a new experimental rig developed by the Centre for Applied Dynamics Research at the University of Aberdeen, capable of reproducing all major types of drill-string vibration. One of the most important features of this versatile experimental rig is the fact that commercial drill-bits, employed in the drilling industry, and real rock-samples are used. The rig operate in different configurations, which enables the experimental study of various phenomena, such as stick-slip oscillations, whirling and drill-bit bounce. It also allows to determine mechanical characteristics of the drill-bits, which are used to calibrate mathematical models.

Original languageEnglish
Article number01002
Number of pages8
JournalMATEC Web of Conferences
Volume211
DOIs
Publication statusPublished - 10 Oct 2018
Event14th International Conference on Vibration Engineering and Technology of Machinery, VETOMAC 2018 - Lisbon, Portugal
Duration: 10 Sep 201813 Sep 2018

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